Developmental surface dyslexia is not associated with deficits in the transient visual system

Donatella Spinelli, Paola Angelelli, Maria De Luca, Enrico Di Pace, Anna Judica, Pierluigi Zoccolotti

Research output: Contribution to journalArticlepeer-review


DEFICITS of the transient visual system have been reported in unselected groups of dyslexics. The aim of this study was to examine whether this finding holds when subjects with a specific type of developmental reading disorder (surface dyslexia) are considered. Ten Italian children were examined. They all presented the characteristic markers of surface dyslexia: slow and laborious reading with errors in tasks which cannot be solved with a grapheme-phoneme conversion (i.e. homophones). Contrast sensitivity thresholds to phase-reversal gratings were within normal limits for most subjects both for stimuli presented centrally and in the right parafovea. This indicates that developmental surface dyslexia is not associated with a deficit in the transient system. In contrast, sensitivity to high spatial frequency stationary stimuli was reduced.

Original languageEnglish
Pages (from-to)1807-1812
Number of pages6
Issue number8
Publication statusPublished - 1997


  • Developmental dyslexia
  • Spatial frequency
  • Surface dyslexia
  • Transient system

ASJC Scopus subject areas

  • Neuroscience(all)


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